摘要
研究滑模变结构控制在三相单级光伏并网系统中的应用,设计了一种基于电压定向的滑模变结构控制器,将并网电流分解为有功和无功分量,控制有功分量为MPPT算法给定的参考值,实现最大功率跟踪,控制无功分量为零,实现单位功率因数并网。该方法将矢量控制理论与滑膜控制技术结合,增强了并网系统的鲁棒性,有效提高了系统的响应速度和并网电能质量。组建样机,进行了稳态和动态实验,示波器测试实验波形表明该方法能实现单位功率因子并网,快速跟踪光伏阵列的最大功率,且电流总谐波畸变率(THD)小于5%。
A novel sliding mode variable structure controller based on voltage-oriented control is designed for three-phase photovoltaic （PV） grid system. The grid-connected current is decomposed into active and reactive components. In order to transfer maximum solar array energy into grid with a unity power factor, the reactive component is adjusted to be zero and the active component is controlled to follow the reference value, which is generated by MPPT controller. This method combines vector control technology with sliding mode control theory, which strengthens robustness of the system, accelerates the response speed and effectively improves the quality of the grid-connected current. A laboratory prototype is set up to perform static and dynamic experiments. Some oscilloscope test waveforms verify that the proposed control strategy can provide fast and effective maximum power point tracking and achieve unity power factor connection for three-phase grid-connected photovoltaic systems, and the total harmonic distortion （THD） rate is less than 5%.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第12期83-87,94,共6页
Power System Protection and Control
基金
衡阳市科技局项目(2011KG64)
关键词
三相光伏并网系统
滑模控制
MPPT
电压定向控制
three-phase grid-connected photovoltaic system
sliding mode control
MPPT
voltage-oriented control
